Terminal slowdown control for elevator system

ABSTRACT

Terminal slowdown control for elevator systems which includes spaced markers and a detector, mounted for relative movement as an elevator car approaches a terminal. The markers are spaced such that if the elevator car is approaching the terminal with a constant deceleration rate, the combination of the spaced markers and detector will produce pulses at a constant rate. If this constant rate is within a predetermined range, the slowdown is normal. If the rate is faster than a predetermined value, comparison means provides a speed error signal which may be used to initiate terminal slowdown, and the same speed error signal may be used to generate an auxiliary speed pattern voltage for use by the elevator control in bringing the car to a stop according to a predetermined deceleration schedule.

United States Patent Winkler TERMINAL SLOWDOWN CONTROL FOR ELEVATORSYSTEM Primary ExaminerBernard A. Gilheany Assistant Examiner-W. E.Duncanson, Jr.

[ 1 Dec. 18, 1973 Attorney-A. T. Stratton et al.

[57] ABSTRACT Terminal slowdown control for elevator systems whichincludes spaced markers and a detector, mounted for relative movement asan elevator car approaches a terminal. The markers are spaced such thatif the elevator car is approaching the terminal with a constantdeceleration rate, the combination of the spaced markers and detectorwill produce pulses at a constant rate. If this constant rate is withina predetermined range, the slowdown is normal. If the rate is fasterthan a predetermined value, comparison means provides a speed errorsignal which may be used to initiate terminal slowdown, and the samespeed error signal may be used to generate an auxiliary speed patternvoltage for use by the elevator control in bringing the car to a stopaccording to a predetermined deceleration schedule.

10 Claims, 23 Drawing Figures I T MIN(: 6

CORRIDOR CALL CONTROL TIMING LIMIT CAR CALL SWITCHES CONTROL IN HATCHWAY52 TIMING 34 6 Ell TO 1 44 1g DOOR FLOOR HALL AR0PERAT0R SELECTOR IfLANTERNS 5s DOOR 2nd LANDING OPERATOR 1 L54 5s MOTOR SPEED PATTERN V 40LONTROLLBQD-GENERATOR b4 J DISTANCE 24 5O I -PuLsEs Ist LANDING D% C%%RI I3 64 L9 -28 32 U X PULSE DE TECTOR FATENTEDDEB I 8 I975 TlMl-CORRIDOR CALL CONTROL E FIG. I I

TIMING 3OIII LANDINC I K LIMIT w CAR CALL 2 CONTROL H' HATCHWAY 52TIMING 34' l 8 36 To w (H E v 44 DOOR FLOOR HALL 3 g; OPERATOR SELECTOR3 LANTERNs 56 2nd LANDING OPERATOR 2 C54 MOTOR SPEED A PATTERN 4ONTROLLER GENERATOR J 5 DISTANCE 24 \EPJ 5O 48 I -RuLsEs ISI LANDINGPULSE DETECTOR IO KN ll 64 O V 1 PULSE DETECTOR DISCRETE I 72 ADVANCEDCAR 82 k POSITION I REvERsIBLE sCAN COUNTER COMPARATOR COUNTER TIMINGSERIAL ADVANCED INDEX MEMORY J74 CAR POSITION L FIG. 2

78 84 'CALLS I 76 E02 COIvIMANDs INDExER COMPARATOR LOGIC ACCELERATION aDECELERATION REOuEsTs I IITIICL D -+R2R AR2LL CAR POSITION I U 34 AE QEE$85K??? 't FLOOR SELECTOR YMENIEUUEC 18 I975 SHEEI 050$ 19 EOtbm w GEmom m 8 m KMPZDOQ 20mm mmm mvm IO: 0 CL NON om wow wow mm Emmi zotomiok11w 1 8 I973 3QT79348 sum as or 19 56 M22153 2M6 n.

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PATENIED m1 8 ms V 3; 779.346

SHEET 080i 19 CAR LOGIC 96 364 368 BY- PASSING UCE m CORRIDOR CALLS 366E BTTM 356 UPTR CCY DCY UCY EQIZ

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' PMENIEDIIEI, I8 I975 .SHEET 11 0F 19 FIG '2 SPEED PATTERN GENERATOR48] suMMING 540 DE CIRCUIT I A TO CAR DIRECTION SRAT ACCX LOGIC RELAYS/(562 UPTR START) L A v '542 A SPS2 WI TIME RAMP ANALOG Q GENERATOR TRANSWITCH WW r544 /ACC 546 TRSYW/ S REVERSIBLE DISTANCE DSAN ANALOG IDLECOUNTER B sLOwDOwN SWITCH I ANALOG 055W 556 SWITCH HTl R R I {-HTANANALOG l SWITCH ANALOG I 553 SWITCH J mm P J 550 55 MIN/Ax TSLN ANALOG PTERMINAL SWTCH SLOWDOWN E 552 L TS NLlG- I DRIVER SPSW -PuLsE DETECTORMOTOR TOVSP DEE DCL TOP TAcH BOTTOM LAZO STARTIAOOXI UPTR L UPTR 564ACCX NAND DGU 568 566 NAND DGD 572 F 570 575 ACCX 574 NAND fivAcc AND576 SPSL D Q SPSI C r580 57s 6 AND I 431 32 FIG. I3 LLOGIC 540PATENIEUUEC 18 ms 3, 779.346

sum 12 or 19 0mm 7 N w h m @mm a mmw vmw amwam If PwmIOf wmw.

owwaw m b muw mww PATENIED DEC 18 I973 SHEET 1501 19 R x N U w w m D mmT E R M M A DN M IIAE LA H TR SS C D T 4 E 6 G A M H 8 I |.ll.1| m 6 D\I\|\J TIME RAMPGENERATOR (TRAN) JERK Q ACCELERATION SPEED (TRAN) SPEED(SRAT) TIME FIG. l6

mmmnnzc 181915 $779346 sum 18 or 19 mm m EMBED J L1: mm c NE @N2 VI Emma0 Mal If P?? s; g I 22 IAIENIEUIIEI.

VOLTAGE V INPUT To FILTER" AMPLIFIER OUTPUT VOLTAGE V OF FILTERAMPLIFIER sEI.

VOLTAGE I+I INPUT TO FILTER AMPLIFIER I054 Y O VOLTAGE OuTPuT OF 2FILTER \/l AMPLIFIER I8 ISIS SIIEEI 18 0F 19 FIG.

TIME

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1. A control system comprising: a structure having a hatchway and aplurality of landings, an elevator car mounted for movement in saidhatchway, a plurality of spaced marker means, detector means, saidspaced marker means and said detector means being mounted for relativemovement in response to movement of the elevator car as it approaches aterminal landing, said marker means being spaced such that as the markermeans and detector means move relative to one another, the elapsed timefrom marker to marker is substantially constant when the elevator car isdecelerating according to a predetermined deceleration schedule, meansresponsive to said detector means providing a first signal responsive tosaid elapsed time from marker to marker, directly indicating themagnitude of speed error, means providing a first reference signalresponsive to a minimum acceptable elapsed time, and first comparatormeans comparing said first signal and said first reference signal, saidfirst comparator means providing an overspeed signal when therelationship between said first signal and said first reference signalindicates an overspeed condition exists.
 2. The control system of claim1 wherein the spaced marker means are mounted in the hatchway, and thedetector means is mounted on the elevator car.
 3. The control system ofclaim 1 including means providing a second reference signal responsiveto an elapsed time which is less than the minimum acceptable elapsedtime, and second comparator means for comparing the first signal withsaid second reference signal, said second comparator means providing anemergency overspeed signal when the relationship between said firstsignal and said second reference signal indicates an emergency overspeedcondition exists.
 4. A control system comprising: a structure having ahatchway and a plurality of landings, an elevator car mounted formovement in said hatchway, a plurality of spaced marker means, saidspaced marker means including an elongated blade member having spacedopenings therein, detector means, said spaced marker means and saiddetector means being mounted for relative movement in response tomovement of the elevator car as it approaches a terminal landing, saidmarker means being spaced such that as the marker means and detectormeans move relative to one another, the elapsed time from marker tomarker is substantially constant when the elevator car is deceleratingat a substantially constant rate, means responsive to said detectormeans providing a first signal responsive to said elapsed time frommarker to marker, means providing a first reference signal responsive toa minimum acceptable elapsed time, and first comparator means comparingsaid first signal and said first reference signal, said first comparatormeans providing an overspeed signal when the relationship between saidfirst signal and said first reference signal indicates an overspeedconditions exists.
 5. A control system comprising: a structure having ahatchway and a plurality of landings, an elevator car mounted formovement in said hatchway, a plurality of spaced marker means, saidspaced marker means including teeth formed on the edge of an elongatedblade, detector means, said spaced marker means and said detector meansbeing mounted for relative movement in response to movement of theelevator car as it approaches a terminal landing, said marker meansbeing spaced such that as the marker means and detector means moverelative to one another, the elapsed time from marker to marker issubstantially constant when the elevator car is decelerating at asubstantially constant rate, means responsive to said detector meansproviding a first signal responsive to said elapsed time from marker tomarker, means providing a first reference signal responsive to a minimumacceptable elapsed time, and first comparator means comparing said firstsignal and said first reference signal, said first comparator meansproviding an overspeed signal when the relationship between said firstsignal and said first reference signal indicates an overspeed conditionexists.
 6. A control system comprising: a structure having a hatchwayand a plurality of landings, an elevator car mounted for movement insaid hatchway, a plurality of spaced marker means, detector means, saiddetector means providing pulse signals in response to the marker means,said spaced marker means and said detector means being mounted forrelative movement in response to movement of the elevator car as itapproaches a terminal landing, said marker means being spaced such thatas the marker means and detector means move relative to one another, theelapsed time from marker to marker is substantially constant when theelevator car is decelerating at a substantially constant rate, meansresponsive to said detector means providing a first signal responsive tosaid elapsed time from marker to marker, said first signal being aunidirectional signal which increases in magnitude as the elapsed timedecreases. means providing a first reference signal responsive to aminimum acceptable elapsed time, and first comparator means comparingsaid first signal and said first reference signal, said first comparatormeans providing an overspeed signal when the relationship between saidfirst signal and said first reference signal indicates an overspeedcondition exists.
 7. The control system of claim 6 wherein the firstsignal is substantially zero when the elapsed time indicates the desireddeceleration rate.
 8. A control system comprising: a structure having ahatchway and a plurality of landings, an elevator car mounted formovement in said hatchway, a plurality of spaced marker means, detectormeans, said spaced marker means and said detector means being mountedfor relative movement in response to movement of the elevator car as itapproaches a terminal landing, said marker means being spaced such thatas the marker means and detector means more relative to one another, theelapsed time from marker to marker is substantially constant when theelevator car is decelerating at a substantially constant rate, saiddetector means providing first pulse signals in response to the markermeans, means responsive to the detector means providing second pulsesignals of predetermined duration in response to said first pulsesignals, means responsive to said second pulse signals providing a firstsignal responsive to the elapsed time from marker to marker, with themagnitude of the first signal being directly proportional to the rate ofthe second pulse signals, means providing a first reference signalresponsive to a minimum acceptable elapsed time, and first comparatormeans comparing said first signal and said first reference signal, saidfirst comparator means providing an overspeEd signal when therelationship between said first signal and said first reference signalindicates an overspeed condition exists.
 9. A control system comprising:a structure having a hatchway and a plurality of landings, an elevatorcar mounted for movement in said hatchway, a plurality of spaced markermeans, detector means, said spaced marker means and said detector meansbeing mounted for relative movement in response to movement of theelevator car as it approaches a terminal landing, said marker meansbeing spaced such that as the marker means and detector means moverelative to one another, the elapsed time from marker to marker issubstantially constant when the elevator car is decelerating at asubstantially constant rate, means responsive to said detector meansproviding a first signal responsive to said elapsed time from marker tomarker, said first signal being a speed error signal having apredetermined magnitude when the elapsed time indicates the desireddeceleration rate, means providing a first reference signal responsiveto a minimum acceptable elapsed time, first comparator means comparingsaid first signal and said first reference signal, said first comparatormeans providing an overspeed signal when the relationship between saidfirst signal and said first reference signal indicates an overspeedcondition exists, means providing a speed signal responsive to the speedof the elevator car, and means summing the speed signal with the firstsignal to provide a terminal slowdown speed pattern signal which may beused to bring the elevator car to a stop when an overspeed condition isdetected.
 10. The control system of claim 9 including a motor for movingthe elevator car in the hatchway, and wherein the means providing thespeed signal responsive to the speed of the elevator car is provided bya tachometer responsive to the speed of the motor.